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XELE > Review Exam: ELEX01 : DC > Flashcards

Review Exam: ELEX01 : DC Flashcards

1
Q

Two resistances of 10 and 15 ohms, each respectively are connected in parallel. The two are then connected in series with a 5-ohm resistance. It is then connected across a 12-V battery, what are the current and power?

A

1.09 A, 13.08 W

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2
Q

When solving for the Thevinen equivalent resistance, RTH:

a. All voltage sources must be opened.
b. None of the choices
c. All voltage sources must be short-circuited.
d. All voltage sources must be converted to current sources.

A

c. All voltage sources must be short-circuited.

Voltage source-Short
Current source- Open

VSCO

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3
Q

A constant-voltage source:

a. None of the choices.
b. Supplies constant-current to any load resistance.
c. Has very low internal reslstance.
d. Has very high internal reststance.

A

c. Has very low internal reslstance.

Ideal voltage source has no resistance

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4
Q

A power station supplies 60 kW to a load over 2,500 ft, 100 mm^2, two-conductor copper feeder, the resistance of which is 0.078 ohm per 1000 ft. The bus bar voltage is maintained constant at 600 V. Determine the load current.

a. 102A
b. 105A
c. 11OA
d. 108A

A

d. 108A

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5
Q

Resistor 1 has twice the resistance of resistor 2. The two are connected in parallel and a potential difference is maintained across the combination. What is the rate thermal energy generation in 1?

a.The same as that in 2.
b.Twice that in 2.
c. Four times that in 2.
d. Half that in 2.

A

d. Half that in 2.

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6
Q

A complete short develops across one of five parallel resistors on a PC board. The most likely result is:

a.The fuse in the power supply will blow.
b. The resistance values will bealtered.
c. The smallest-value resistor will burn out.
d. One or more of the other resistors will burn out.

A

a.The fuse in the power supply will blow.

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7
Q

A Thevenin equivalent circuit consist of:

a. A voltage source in parallel with a resistance.
b. Two voltage sources and a resistance.
c. A current source in parallel with a resistance.
d. A voltage source in series with a resistance.

A

d. A voltage source in series with a resistance.

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8
Q

In the context of the loop and junction rules for electrical circuits a junction is:

a. Where three or more wires are joined.
b. Where only two wires are joined.
c. Where a wire is connected to a battery.
d. Where a wire is connected to a resistor.

A

a. Where three or more wires are joined.

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9
Q

Two 110-V light bulbs, one “25 W” and the other” lOOW”, are connected in series to a 110 V source. Then:

a. None of the choices.
b. The current in the 100-W bulb is greater than that in the 25-W bulb.
c. The current in the !00-W bulb is less than that in the 25-W bulb.
d. Both bulbs will light with equal brightness.

A

a. None of the choices.

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10
Q

Kirchhoff’s current law states that:

a. The algebraic sum of the currents entering and leaving any point in a circuit must equal zero.
b.The algebraic sum of the currents flowing away from any point in a circuit must equal zero.
c. The algebraic sum of the currents flowing into any point in a circuit must equal zero.
d. The algebraic sum of the currents around any closed path must equal zero.

A

a. The algebraic sum of the currents entering and leaving any point in a circuit must equal zero.

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11
Q

The output of a certain voltage divider is 9 V with no load. When a load is connected, the output voltage:

a. Decreases
b.Becomes zero
c. Remains the same
d. Increases

A

a. Decreases

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12
Q

Two wires made of the same material have the same lengths but different diameters. They are connected in series to a battery. The quantity that is the same for the wires.is:

a. The end-to-end potential difference.
b. The current density.
c. The current.
d. The electron drift velocity.

A

c. The current.

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13
Q

In a series circuit, the largest resistance has:

a. The smallest voltage drop.
b. More current than the other resistors.
c. The largest voltage drop.
d. Both the largest voltage drop and more current than the other resistors.

A

c. The largest voltage drop.

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14
Q

Kirchhoff’s voltagelaw states that:

a. None of the choices.
b. The algebraic sum ofall the currents. flowing around any closed loop must equal zero.
c. The algebraic sum of the voltage sources and IRvoltage drops in any closed path must total zero.
d, The algebraic sum of the voltage sources and IR voltage drops around any closed path can never equal zero.

A

c. The algebraic sum of the voltage sources and IRvoltage drops in any closed path must total zero.

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15
Q

A battery is connected across a series combination of two identical resistors. If the potential difference across the terminals is V and the current in the battery is i, then:

a. The potential difference across each resistor is V/2 and the current in each resistor is i/2
b. The potential difference across each resistor is V and the current in each resistor is i/2
c. The potential difference across eac.h resistor is V/2 and the current in each resistor Is i
d. The potential difference across each resistor is V and the current in each resistor is i.

A

c. The potential difference across eac.h resistor is V/2 and the current in each resistor Is i

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16
Q

When an additional resistor is connected across existing parallel circuit, the total resistance .

a. increases
b. decreases
c. remains the same
d. increases by the value of the added resistor

A

b. decreases

17
Q

A 220-ohm R1, 2.2-kohm R2, and 200-ohm R,3 are connected across 15 Vof applied voltage. What happens to R_EQ if the applied voltage is doubled to 30 V?

a. R_EQ doubles.
b. R_EQ cuts in half.
c. R_EQ increases but is not double its original value.
d. R_EQ does not change.

A

d. R_EQ does not change.

18
Q

The resistance of resistor 1 is twice the resistance of resistor 2. The two are connected in series and a potential difference is maint.1ined across the combination. Then:

a. the current in l is half that in 2
b. the current in l is twice that in 2
c. the potential difference across 1 is twice that across 2
d. the potential difference across 1 is half that across 2

A

c. the potential difference across 1 is twice that across 2

19
Q

If one of the resistors in a parallel circuit is removed, the total resistance:

a. Doubles.
b. Decreases by the value of the removed resistor.
c. Remains the same.
d. Increases.

A

d. Increases.

20
Q

A series circuit consists of a battery with internal resistance rand an external resistor R. If these two resistances are equal (r = R) Then the thermal energy generated per unit time by the internal resistance r is:

a. Twice that by R
b. One-third that by R
c. Half that by R
d. The same as by R

A

d. The same as by R

21
Q

Nine identical wires, each of diameter d and length L, are connected in series. The combination hasthe same resistance as a single similar wire of length L but whose diameter is:

a. d/9
b. 3d
c. d/3
d. 9d

A

c. d/3

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